My mother has been doing that since the beginning of november. Her singing is terrible. Not to mention since then she's been complaining our local supermarket isn't playing christmas songs yet.
This holiday makes some people unbearable.

Pretty sure someone's aloud to complain about an annoying thing their parents do. Parents complain about their kids all the time. No need to bring death into it and make him feel guilty for something that hasn't even happened.

Breaking news :
Not everyone has nice parents. I was told the same thing about my father and i don't miss him one bit.
Just because my mother sings the same cheesy songs for 2 months 24/7 doesn't mean she isn't abusive the rest of the time. I'm sorry, next time maybe i should put "ps: she's a jerk all the time" so people don't jump on the "be grateful you have a mom" wagon.
And having only one of something doesn't make it good by the way.

I think signing is a respectable talent. I don't know sign language and learning the basics wouldn't hurt. OP should definitely put up YouTube videos of that. Its not like signing requires something like musical talent or whatever c;